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Fair Value (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Derivative [Line Items]      
Aggregate principal balance of loans held for sale $ 250,826    
Fair Value (Textual) [Abstract]      
Average basis points of loan amount 0.63%    
Fall out rate of measuring fair value of rate lock commitments 9.00%    
Fair value of mortgage loans held for sale 252,352    
Increase/Decrease in fair value of loans held for sale 1,526    
Fair value adjustment gain/loss (1,080) (335) 437
Rate Lock Commitments [Member]
     
Derivative [Line Items]      
Notional or Principal Amount 126,929    
Aggregate principal balance of loans held for sale 126,929    
Notional of open forward delivery contracts [Member]
     
Derivative [Line Items]      
Notional or Principal Amount 353,555    
Aggregate principal balance of loans held for sale $ 353,555